Fuel supply control for gas turbine engines

Claim 1

AN ACCELERATION CONTROL FOR A GAS TURBINE ENGINE, COMPRISING IN COMBINATION A FUEL SYSTEM FOR SUPPLYING FUEL TO THE ENGINE, A FLOW METER FOR PRODUCING AN ELECTRICAL SIGNAL DEPENDENT ON THE RATE OF SUPPLY OF FUEL TO THE ENGINE BY THE FUEL SYSTEM, FIRST FUNCTION GENERATING MEANS FOR PRODUCING A FIRST VOLTAGE VARYING WITH ENGINE SPEED IN THE MANNER OF THE STEADY RUNNING FUEL FLOW CURVE OF THE ENGINE, SECOND FUNCTION GENERATING MEANS FOR PRODUCING A SECOND VOLTAGE WHICH VARIES WITH ENGINE SPEED IN A MANNER TO REPRESENT THE EXCESS FUEL OVER SAID STEADY STATE FUEL WHICH IS REQUIRED AT ANY GIVEN SPEED TO ACCELERATE THE ENGINE RAPIDLY WITHOUT STALLING, FIRST AND SECOND POTENTIOMETERS EACH INCLUDING A FIXED RESISTOR AND A SLIDER MOVABLE THEREON, THE FIRST AND SECOND VOLTAGES BEING APPLIED ACROSS THE RESISTORS OF FIRST AND SECOND POTENTIOMETERS RESPECTIVELY, A FIRST DIFFERENCE AMPLIFIER RECEIVING A FIRST INPUT FROM THE SLIDER OF THE FIRST POTENTIOMETER AND A SECOND INPUT FROM THE FLOW METER, AND PRODUCING AN OUTPUT WHEN THE INPUTS ARE UNEQUAL, A REVERSIBLE MOTOR OPERABLE BY THE OUTPUT FROM THE FIRST DIFFERENCE AMPLIFIER AND COUPLED TO THE SLIDERS OF BOTH POTENTIOMETERS FOR MOVING THE SLIDERS UNTIL THE INPUTS TO THE FIRST DIFFERENCE AMPLIFIER ARE EQUAL, A SECOND DIFFERENCE AMPLIFIER RECEIVING A FIRST